Electromechanical spindle drive

Abstract

An electromechanical spindle drive includes a housing, a motor, a rotational part in the form of a spindle nut, the rotational part being rotated by the motor about a rotational axis, a spindle which interacts with the rotational part, the threaded section of which is arranged within the rotational part and which exits the rotational part at a spindle outlet end, and bearings by means of which the rotational part is rotatably mounted relative to the housing, wherein at least one, preferably at least two of the bearings, are arranged in the region of the spindle outlet end of the rotational part and/or are designed in the form of a radial bearing.

The invention claimed is: 
     
         1 . An electromechanical spindle drive comprising:
 a housing,   a motor,   a rotational part comprising a spindle nut, wherein the rotational part is rotatable by the motor about a rotational axis,   a spindle interacting with the rotational part and comprising a, threaded section arranged within the rotational part and exiting the rotational part at a spindle outlet end, and   a plurality of bearings rotatably mounting the rotational part relative to the housing,   wherein a bearing of the plurality of bearings is arranged in a region of the spindle outlet end of the rotational part, inside the rotational part and on an inner side of the rotational part.   
     
     
         2 . The electromechanical spindle drive according to  claim 1 , wherein the bearing arranged in the region of the spindle outlet end of the rotational part is arranged between an inside of the rotational part and a bearing seat projecting into an interior of the rotational part. 
     
     
         3 . The electromechanical spindle drive according to  claim 1 , wherein the bearing arranged in the region of the spindle outlet end of the rotational part is arranged so as to axially overlap with at least one of a stator and a rotor of the motor or is arranged within an area enclosed by the at least one of the stator and the rotor or is arranged so as to axially overlap and be within the area enclosed by the at least one of the stator and the rotor. 
     
     
         4 . The electromechanical spindle drive according to  claim 1 , wherein the bearing arranged in the region of the spindle outlet end of the rotational part is a rolling bearing. 
     
     
         5 . The electromechanical spindle drive according to  claim 1 , wherein at least one bearing of the plurality of bearings is arranged in an area of an end of the rotational part opposite the spindle outlet end. 
     
     
         6 . The electromechanical spindle drive according to  claim 1 , wherein at least one bearing of the plurality of bearings is an axial bearing arranged in an area between the motor and a braking device of the electromechanical spindle drive. 
     
     
         7 . The electromechanical spindle drive according to  claim 1 , wherein at least one of a stator of the motor surrounds the rotational part a rotor of the motor comprises pole elements mounted on an outside of the rotational part and, the motor is a synchronous motor. 
     
     
         8 . An electromechanical spindle drive comprising:
 a housing,   a motor,   a rotational part comprising a spindle nut, wherein the rotational part is rotatable by the motor about a rotational axis,   a spindle interacting with the rotational part and comprising a threaded section arranged within the rotational part and exiting the rotational part at a spindle outlet end,   a plurality of bearings rotatably mounting the rotational part relative to the housing, and   a rolling spindle drive in which rolling elements are guided in a circulating path,   wherein a first portion of the circulating path is formed between an internal thread of the rotational part and an external thread of the spindle and a second portion of the circulating path is formed by a return channel, formed in an interior of the spindle.   
     
     
         9 . An electromechanical spindle drive comprising:
 a housing,   a motor,   a rotational part comprising a spindle nut, wherein the rotational part is rotatable by the motor about a rotational axis,   a spindle interacting with the rotational part and comprising a threaded section arranged within the rotational part and exiting the rotational part at a spindle outlet end,   a plurality of bearings rotatably mounting the rotational part relative to the housing, and   an attachment part at an end of the rotational part opposite the spindle outlet end and connected to the rotational part,   wherein a portion of the attachment part located outside the rotational part is formed in a shape of a pin,   wherein a longitudinal axis of the portion of the attachment part formed in the shape of the pin coincides with the rotational axis of the rotational part.   
     
     
         10 . The electromechanical spindle drive according to  claim 9 , wherein a maximum diameter of a portion of the attachment part located inside the rotational part is at least 3 times as large as a diameter of the portion of the attachment part formed in the shape of the pin. 
     
     
         11 . An electromechanical spindle drive comprising:
 a housing,   a motor,   a rotational part comprising a spindle nut, wherein the rotational part is rotatable by the motor about a rotational axis,   a spindle interacting with the rotational part and comprising a threaded section arranged within the rotational part and exiting the rotational part at a spindle outlet end,   a plurality of bearings rotatably mounting the rotational part relative to the housing,   an attachment part at an end of the rotational part opposite the spindle outlet end and connected to the rotational part, and   a sensor device, wherein a portion of the attachment part located outside the rotation part is disposed in a detection range of the sensor device.   
     
     
         12 . An electromechanical spindle drive comprising:
 a housing,   a motor,   a rotational part comprising a spindle nut, wherein the rotational part is rotatable by the motor about a rotational axis,   a spindle interacting with the rotational part and comprising a threaded section arranged within the rotational part and exiting the rotational part at a spindle outlet end,   a plurality of bearings rotatably mounting the rotational part relative to the housing,   an attachment part at an end of the rotational part opposite the spindle outlet end and connected to the rotational part, and   a lubricant channel is configured in the attachment part for supplying lubricant to an interior of the rotational part.   
     
     
         13 . The electromechanical spindle drive according to  claim 12 , wherein a path of a first portion of the lubricant channel is aligned with the rotational axis of the rotational part. 
     
     
         14 . The electromechanical spindle drive according to  claim 13 , wherein a path of a second portion of the lubricant channel has a radial component with respect to the rotational axis or is oblique to the rotational axis or has a radial component with respect to the rotational axis and is oblique to the rotational axis. 
     
     
         15 . An electromechanical spindle drive comprising:
 a housing,   a motor,   a rotational part comprising a spindle nut, wherein the rotational part is rotatable by the motor about a rotational axis,   a spindle interacting with the rotational part and comprising a threaded section arranged within the rotational part and exiting the rotational part at a spindle outlet end,   a plurality of bearings rotatably mounting the rotational part relative to the housing,   an attachment part at an end of the rotational part opposite the spindle outlet end and connected to the rotational part, and   a braking device surrounding the attachment part.   
     
     
         16 . The electromechanical spindle drive according to  claim 1 , wherein cooling fins are arranged on an outside of the housing, at least in an area of the motor, wherein the cooling fins are removable from the housing body. 
     
     
         17 . The electromechanical spindle drive according to  claim 1 , comprising a modular design. 
     
     
         18 . The electromechanical spindle drive according to  claim 1 , further comprising a braking device which can be actuated between a braking position and a released position, wherein the braking device acts on the rotational part. 
     
     
         19 . The electromechanical spindle drive according to  claim 1 , further comprising a braking device having a brake disc that rotates with the rotational part and a braking element that can be adjusted in an axial direction and acts on the brake disc in a braking position. 
     
     
         20 . An electromechanical spindle drive comprising:
 a housing,   a motor,   a rotational part comprising a spindle nut, wherein the rotational part is rotatable by the motor about a rotational axis,   a spindle interacting with the rotational part and comprising a threaded section arranged within the rotational part and exiting the rotational part at a spindle outlet end,   a plurality of bearings rotatably mounting the rotational part relative to the housing,   an attachment part at an end of the rotational part opposite the spindle outlet end and connected to the rotational part, and   a braking device having a brake disc that rotates with the rotational part and a braking element that can be adjusted in an axial direction and acts on the brake disc in a braking position,   wherein the brake disc has   an inner area,   a friction surface area extending annularly around the rotational axis with a first friction surface formed on a first side of the brake disc, and   an intermediate area extending between the friction surface area and the inner area around the rotational axis, and   wherein a first mating surface is formed on the braking element, which first mating surface faces the first friction surface and interacts with the first friction surface in the braking position.   
     
     
         21 . The electromechanical spindle drive according to  claim 20 , wherein the intermediate area of the brake disc, both in a released position and in the braking position, is free of contact with the braking element. 
     
     
         22 . The electromechanical spindle drive according to  claim 20 , wherein the intermediate area is a deformation area which is elastically deformable in the axial direction by an action of the brake element on the brake disc. 
     
     
         23 . The electromechanical spindle drive according to  claim 20 , wherein the friction surface area comprises a second friction surface formed on a second side of the brake disc opposite to the first side, and wherein the friction surface area of the brake disc is arranged between the first mating surface and a second mating surface facing the second friction surface and cooperating with the second friction surface in the braking position. 
     
     
         24 . A spindle drive component set comprising components for a plurality of electromechanical spindle drives according to  claim 8 , the component set comprising components of different types, the components having connection interfaces for connecting the components to one another,
 wherein components of a same type have different sizes,   wherein the connection interfaces of differently sized components of the same type are of same dimensions.   
     
     
         25 . The spindle drive component set according to  claim 24 , wherein the component set comprises:
 first housing parts having at least one of a of different length and a different width, and   second housing parts having at least one of a of different length and a different width,   wherein the connection interfaces of the first housing parts for connection to the second housing parts have the same dimensions for all first housing parts and for all second housing parts.   
     
     
         26 . The spindle drive component set according to  claim 24  wherein the component set comprises at least one of:
 rotational parts having at least one of a of different length and a different width, 
 housing parts having at least one of a of different length and a different width, and 
 motors having at least one of a of different length and a different width, 
 wherein at least one of the connection interfaces of the rotational parts for connection to at least one of the housing parts and the motors have the same dimensions for all rotational parts, and the connection interfaces of at least one of the housing parts and the motors for connection to the rotational parts have the same dimensions for at least one of all of the housing parts and all of the motors. 
 
     
     
         27 . A forming machine comprising:
 an electromechanical drive comprising the electromechanical spindle device according to  claim 8 , and   a forming tool whose working movement is effected by the electromechanical drive.   
     
     
         28 . A method for forming a workpiece with a forming machine comprising the steps of:
 providing the forming machine according to  claim 27 , and   controlling the motor of the electromechanical spindle drive for forming the workpiece with a control device.   
     
     
         29 . The electromechanical spindle drive according to  claim 8 , wherein a bearing of the plurality of bearings is arranged in a region of the spindle outlet end of the rotational part or is designed in a form of a radial bearing or is arranged in the region of the spindle outlet end of the rotational part and designed in the form of the radial bearing. 
     
     
         30 . The electromechanical spindle drive according to  claim 9 , wherein a bearing of the plurality of bearings is arranged in a region of the spindle outlet end of the rotational part or is designed in a form of a radial bearing or is arranged in the region of the spindle outlet end of the rotational part and designed in the form of the radial bearing. 
     
     
         31 . The electromechanical spindle drive according to  claim 11 , wherein a bearing of the plurality of bearings is arranged in a region of the spindle outlet end of the rotational part or is designed in a form of a radial bearing or is arranged in the region of the spindle outlet end of the rotational part and designed in the form of the radial bearing. 
     
     
         32 . The electromechanical spindle drive according to  claim 12 , wherein a bearing of the plurality of bearings is arranged in a region of the spindle outlet end of the rotational part or is designed in a form of a radial bearing or is arranged in the region of the spindle outlet end of the rotational part and designed in the form of the radial bearing. 
     
     
         33 . The electromechanical spindle drive according to  claim 15 , wherein a bearing of the plurality of bearings is arranged in a region of the spindle outlet end of the rotational part or is designed in a form of a radial bearing or is arranged in the region of the spindle outlet end of the rotational part and designed in the form of the radial bearing. 
     
     
         34 . The electromechanical spindle drive according to  claim 20 , wherein a bearing of the plurality of bearings is arranged in a region of the spindle outlet end of the rotational part or is designed in a form of a radial bearing or is arranged in the region of the spindle outlet end of the rotational part and designed in the form of the radial bearing.